1297666944 has 384 divisors, whose sum is σ = 4582656000. Its totient is φ = 344494080.

The previous prime is 1297666939. The next prime is 1297666957. The reversal of 1297666944 is 4496667921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (384).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7249447 + ... + 7249625.

It is an arithmetic number, because the mean of its divisors is an integer number (11934000).

Almost surely, 2^1297666944 is an apocalyptic number.

1297666944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1297666944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2291328000).

1297666944 is an abundant number, since it is smaller than the sum of its proper divisors (3284989056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1297666944 is a wasteful number, since it uses less digits than its factorization.

1297666944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 251 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 1297666944 is about 36023.1445601297. The cubic root of 1297666944 is about 1090.7395996074.

The spelling of 1297666944 in words is "one billion, two hundred ninety-seven million, six hundred sixty-six thousand, nine hundred forty-four".